Size: 30*14*57cm Sandbag Sled Trainer: Helps train sprinters, football players, and other athletes to strengthen lower-body muscles, improve speed, explosiveness, leg strength, and endurance Durable & Damp-Proof: Made of thickened PVC material, waterproof and moisture-proof surface; both the sled and weight bags are built to withstand drags and quick changes in direction, suitable for indoor and outdoor use Weight Adjustable: Includes three removable weight bags; each bag can be filled with up to 10 pounds of sand (sand not included), allowing customizable weight from 10 to 30 lbs to meet varying workout needs Multi-Direction Training: Supports training in multiple directions to enhance strength and mobility, offering greater exercise flexibility; adjustable waist strap with soft, comfortable, breathable lining, suitable for users of different body types Multi-Purpose: Enables intensified sprinting drills with added variety; incorporate hills, directional changes, rows, drags, and more to achieve full-body workout benefits from this versatile equipment